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This is a request to change the xrootd server version and also have a minor update for of the client tools.

Server version update

We would like to upgrade the xrootd server version for the Fermi xrootd cluster from version 20080828-1632 to 20090202-1402. The main change between these two versions are:

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The first time a xrootd client connects to a cluster it tries FirstConnectMaxCnt times to connect before it will fail. The default for this number is 150 but for xrd.pl it is overwritten and set to 10. Therefore a client will fail after about 3.3 min (the wait between connection attempts is 20s20sec) whereas with the default setting the client will fail only after 50 min. This is import as for an outage which typically last from 5-30 min we stop the redirector to avoid clients from being redirected and with the short wait time xrd.pl might fail.

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The new version has been installed as a test version on the Fermi xrootd cluster which allows access to the glast data. The production crawler is using this version for more than a month.
Also skimmer jobs were run successfully run against this version.

The fix to the timeout for xrd.pl has been tested. It has been verified that it will wait the expected time if a xrootd server is not available.

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Details

Server version upgrade

cmsd logfile name change

At the same time of the restart I would like to change the logfile name for the cmsd from olbdlog to cmsdlog this requires to change the name in StartXrd.cf.glast:

1. CMSLOGFN=cmsdlog

Restart of xrootd

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The restart should take less then five minutes. Stopping the redirectors first prevents clients being redirected and the chance that a file is not found because a data server is being restarted. The clients will wait during the restart while the xrootds are down and reconnect to once the data servers and redirectors are up.

Update the client

1. Change the link /afs/slac.stanford.edu/g/glast/applications/xrootd/PROD from
   @sys/20080728-0933/ to dist/20080728-0933v1/@sys

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The layout of the xrootd application area changed switching the afs-sysname with and release-name
(e.g.: i386_rhel30/20080728-0933v1 to 20080728-0933v1/i386_rhel30).